13531687 has 4 divisors (see below), whose sum is σ = 14572600. Its totient is φ = 12490776.

The previous prime is 13531669. The next prime is 13531703. The reversal of 13531687 is 78613531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78613531 = 2591 ⋅30341.

It is a cyclic number.

It is not a de Polignac number, because 13531687 - 2⁷ = 13531559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13531607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520437 + ... + 520462.

It is an arithmetic number, because the mean of its divisors is an integer number (3643150).

Almost surely, 2^13531687 is an apocalyptic number.

13531687 is a deficient number, since it is larger than the sum of its proper divisors (1040913).

13531687 is a wasteful number, since it uses less digits than its factorization.

13531687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040912.

The product of its digits is 15120, while the sum is 34.

The square root of 13531687 is about 3678.5441413690. The cubic root of 13531687 is about 238.2963084394.

The spelling of 13531687 in words is "thirteen million, five hundred thirty-one thousand, six hundred eighty-seven".